The experiment[ edit ] The apparatus constructed by Cavendish was a torsion balance made of a six-foot 1. Vertical section drawing of Cavendish's torsion balance instrument including the building in which it was housed. The large balls were hung from a frame so they could be rotated into position next to the small balls by a pulley from outside.
For an example of an 'Open' EEI task sheet, click here. Photovoltaic power generation employs solar panels comprising a number of cells containing a photovoltaic material.
The Australian Government provides incentives for the use of PVs for both domestic and industrial use you can save money, and save the environment. Solar photovoltaics generates electricity in more than countries and, while yet comprising a tiny fraction of the GW total global power-generating capacity from all sources, is the fastest growing power-generation technology in the world.
Between andgrid-connected PV capacity increased at an annual average rate of 60 percent, to some 21 GW.
A good EEI would be to measure current as a function of the angle of incidence of sunlight all within a short period of time eg 30 minutes ; measure current when collector is perpendicular to rays during the day how should that go?
But maybe you'll need to consider more than current; perhaps the power output is more important. If so, you could put a load on the circuit resistor and measure V and I. In the method shown below, Moreton Bay College students are measuring the effect of angle on the flow rate hence power output of a electrical water pump.
This was Year Energy output of a solar panel II You could also investigate the effect of shade on the output of a panel. In this photo, students are using layers 1, 2, 3 etc of shade cloth.
It would also be interesting to see the effect of light of different wavelength to see if the solar cells are sensitive to all wavelengths. You could use coloured cellophane - but then that reduces intensity and not all coloured cellophane has the same percentage transmission.
This limitation makes photovoltaic cells an unreliable source of power for unattended or remote devices, such as solar-powered traffic signs or NASA's Mars Rover. For large-scale solar plants to maintain their maximum efficiency, the photovoltaic cells must be kept clean, which can be a challenging task in dusty environments.
One good EEI would be to investigate the effect of dust on the solar panel. This is a harder EEI than the two above. It involves setting up a solar panel a short distance from an incandescent bulb eg 15 cm and adding controlled amounts of "dust" eg bentonite clay powder, fine sand, icing sugar to the face of the panel spread evenly.
It is a good idea to adjust the panel so it is working at maximum power. Do this by setting up the circuit on the left below, using either a variable resistor or fixed resistors that can be varied from 0 ohm to ohm. Plot a graph next figure to see the maximum power point.
Then add the bentonite 0. A good article is in Physics Education, V45, Septemberpage Solar panel output and temperature The output of a solar photo-voltaic PV panel changes during the day for two reasons: Here's what one user Cabel said on the Whirlpool Forum: I have 16 Suntech panels.
I don't have the actual voltage outputs vs temperatures, but comparing my best clear day since installation, Any cloud cover on these days seems to help output a lot also. I have got I also have black tiles but have a good 50mm gap between roof and panels so it should have reasonable airflow.
This suggests a good EEI. Then with constant illumination, you could put the PV panel on top of a hotplate and crank up the temperature.
How high a temperature - well, you can decide. Alternatively, you could hold the temperature constant and vary the illumination.Thus, the following objectives were emphasized in this experiment: to determine the equilibrant force using the force table and the component method, to determine the unknown forces using the first condition and second conditions for equilibrium, to locate the centre of gravity of a composite body, and to demonstrate rational equilibrium.
2. Physics Phenomena "Physics is Fun" (Feimer's Physics Page) Physics Dictionary. A B C D E F G H I J K L M N O P Q R S T U V W X Y Z. The Letter A: Absolute zero. gravity, and the force holding it up is called tension. For the object to be in equilibrium, the force due to gravity must be equal to the force of tension in the rope.
Consider the two objects pictured in the force diagram shown below. Note that the two objects are at equilibrium because the forces that act upon them are balanced; however, the individual forces are not equal to each other.
The 50 N force is not equal to the 30 N force. If an object is at equilibrium, then the forces are balanced. Modern Physics is the most up-to-date, accessible presentation of modern physics available. The book is intended to be used in a one-semester course covering modern physics for students who have already had basic physics and calculus courses.
Physics: Physics, science that deals with the structure of matter and the interactions between the fundamental constituents of the observable universe. In the broadest sense, physics (from the Greek physikos) is concerned with all aspects of nature on both the macroscopic and submicroscopic levels. Its.